https://bugs.kde.org/show_bug.cgi?id=420157
Bug ID: 420157
Summary: Desktop is unresponsive after ALT+Tabbing
Product: kwin
Version: 5.18.4
Platform: Neon Packages
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: kwin-bugs-n...@kde.org
Reporter: elraidith+kdebugrepo...@gmail.com
Target Milestone: ---
STEPS TO REPRODUCE
1. Alt+TAB to another window a few times (Usually less than 10 switches from
email to browser, or game to browser, will do it.)
2. Screen freezes, things are still rendering, for example, a game will
continue to update, but will not be accessible, all keyboard input is ignored
from the freeze. The task switcher will stay stuck rendering a grey window
(without any icons or application information)
I am using Task Switcher in text mode, now, with "Show selected window"
disabled, which has yielded a few more switches from app to app before this
occurs.
I have also tried all 3 available engines in the compositor, ogl 2 and 3, as
well as XRender, all produce the same bug.
As well as trying other rendering engines, I have searched for this issue on
google and came up with some results that others were having similar problems
on other hardware.
SOFTWARE/OS VERSIONS
Operating System: KDE neon 5.18
KDE Plasma Version: 5.18.4
KDE Frameworks Version: 5.69.0
Qt Version: 5.14.1
Kernel Version: 5.3.0-46-generic
OS Type: 64-bit
Processors: 16 × AMD Ryzen 7 3800X 8-Core Processor
Memory: 31.4 GiB of RAM
ADDITIONAL INFORMATION
Ryzen 7 3800X
```
clinfo
Number of platforms 2
Platform Name Clover
Platform Vendor Mesa
Platform Version OpenCL 1.1 Mesa 20.1.0-devel
(git-9bf8e92 2020-04-15 bionic-oibaf-ppa)
Platform Profile FULL_PROFILE
Platform Extensions cl_khr_icd
Platform Extensions function suffix MESA
Platform Name AMD Accelerated Parallel
Processing
Platform Vendor Advanced Micro Devices, Inc.
Platform Version OpenCL 2.1 AMD-APP (3004.6)
Platform Profile FULL_PROFILE
Platform Extensions cl_khr_icd
cl_amd_event_callback cl_amd_offline_devices
Platform Host timer resolution 1ns
Platform Extensions function suffix AMD
Platform Name Clover
Number of devices 1
Device Name AMD Radeon RX 5700 (NAVI10,
DRM 3.33.0, 5.3.0-46-generic, LLVM 9.0.1)
Device Vendor AMD
Device Vendor ID 0x1002
Device Version OpenCL 1.1 Mesa 20.1.0-devel
(git-9bf8e92 2020-04-15 bionic-oibaf-ppa)
Driver Version 20.1.0-devel
Device OpenCL C Version OpenCL C 1.1
Device Type GPU
Device Profile FULL_PROFILE
Device Available Yes
Compiler Available Yes
Max compute units 36
Max clock frequency 1750MHz
Max work item dimensions 3
Max work item sizes 256x256x256
Max work group size 256
=== CL_PROGRAM_BUILD_LOG ===
fatal error: cannot open file '/usr/lib/clc/gfx1010-amdgcn-mesa-mesa3d.bc': No
such file or directory
Preferred work group size multiple <getWGsizes:675: build
program : error -11>
Preferred / native vector sizes
char 16 / 16
short 8 / 8
int 4 / 4
long 2 / 2
half 0 / 0 (n/a)
float 4 / 4
double 2 / 2
(cl_khr_fp64)
Half-precision Floating-point support (n/a)
Single-precision Floating-point support (core)
Denormals No
Infinity and NANs Yes
Round to nearest Yes
Round to zero No
Round to infinity No
IEEE754-2008 fused multiply-add No
Support is emulated in software No
Correctly-rounded divide and sqrt operations No
Double-precision Floating-point support (cl_khr_fp64)
Denormals Yes
Infinity and NANs Yes
Round to nearest Yes
Round to zero Yes
Round to infinity Yes
IEEE754-2008 fused multiply-add Yes
Support is emulated in software No
Address bits 64, Little-Endian
Global memory size 8589934592 (8GiB)
Error Correction support No
Max memory allocation 6871947673 (6.4GiB)
Unified memory for Host and Device No
Minimum alignment for any data type 128 bytes
Alignment of base address 32768 bits (4096 bytes)
Global Memory cache type None
Image support No
Local memory type Local
Local memory size 32768 (32KiB)
Max number of constant args 16
Max constant buffer size 2147483647 (2GiB)
Max size of kernel argument 1024
Queue properties
Out-of-order execution No
Profiling Yes
Profiling timer resolution 0ns
Execution capabilities
Run OpenCL kernels Yes
Run native kernels No
Device Extensions cl_khr_byte_addressable_store
cl_khr_global_int32_base_atomics cl_khr_global_int32_extended_atomics
cl_khr_local_int32_base_atomics cl_khr_local_int32_extended_atomics
cl_khr_int64_base_atomics cl_khr_int64_extended_atomics cl_khr_fp64
Platform Name AMD Accelerated Parallel
Processing
Number of devices 1
Device Name gfx1010
Device Vendor Advanced Micro Devices, Inc.
Device Vendor ID 0x1002
Device Version OpenCL 2.0 AMD-APP (3004.6)
Driver Version 3004.6 (PAL,LC)
Device OpenCL C Version OpenCL C 2.0
Device Type GPU
Device Board Name (AMD) AMD Radeon RX 5700
Device Topology (AMD) PCI-E, 09:00.0
Device Profile FULL_PROFILE
Device Available Yes
Compiler Available Yes
Linker Available Yes
Max compute units 18
SIMD per compute unit (AMD) 2
SIMD width (AMD) 32
SIMD instruction width (AMD) 1
Max clock frequency 1750MHz
Graphics IP (AMD) 10.10
Device Partition (core)
Max number of sub-devices 18
Supported partition types None
Max work item dimensions 3
Max work item sizes 1024x1024x1024
Max work group size 256
Preferred work group size (AMD) 256
Max work group size (AMD) 1024
Preferred work group size multiple 32
Wavefront width (AMD) 32
Preferred / native vector sizes
char 4 / 4
short 2 / 2
int 1 / 1
long 1 / 1
half 1 / 1
(cl_khr_fp16)
float 1 / 1
double 1 / 1
(cl_khr_fp64)
Half-precision Floating-point support (cl_khr_fp16)
Denormals No
Infinity and NANs No
Round to nearest No
Round to zero No
Round to infinity No
IEEE754-2008 fused multiply-add No
Support is emulated in software No
Single-precision Floating-point support (core)
Denormals Yes
Infinity and NANs Yes
Round to nearest Yes
Round to zero Yes
Round to infinity Yes
IEEE754-2008 fused multiply-add Yes
Support is emulated in software No
Correctly-rounded divide and sqrt operations Yes
Double-precision Floating-point support (cl_khr_fp64)
Denormals Yes
Infinity and NANs Yes
Round to nearest Yes
Round to zero Yes
Round to infinity Yes
IEEE754-2008 fused multiply-add Yes
Support is emulated in software No
Address bits 64, Little-Endian
Global memory size 8573157376 (7.984GiB)
Global free memory (AMD) 8306688 (7.922GiB)
Global memory channels (AMD) 8
Global memory banks per channel (AMD) 4
Global memory bank width (AMD) 256 bytes
Error Correction support No
Max memory allocation 4244635648 (3.953GiB)
Unified memory for Host and Device No
Shared Virtual Memory (SVM) capabilities (core)
Coarse-grained buffer sharing Yes
Fine-grained buffer sharing Yes
Fine-grained system sharing No
Atomics No
Minimum alignment for any data type 128 bytes
Alignment of base address 2048 bits (256 bytes)
Preferred alignment for atomics
SVM 0 bytes
Global 0 bytes
Local 0 bytes
Max size for global variable 3820172032 (3.558GiB)
Preferred total size of global vars 8573157376 (7.984GiB)
Global Memory cache type Read/Write
Global Memory cache size 16384 (16KiB)
Global Memory cache line size 64 bytes
Image support Yes
Max number of samplers per kernel 16
Max size for 1D images from buffer 134217728 pixels
Max 1D or 2D image array size 2048 images
Base address alignment for 2D image buffers 256 bytes
Pitch alignment for 2D image buffers 256 pixels
Max 2D image size 16384x16384 pixels
Max 3D image size 2048x2048x2048 pixels
Max number of read image args 128
Max number of write image args 64
Max number of read/write image args 64
Max number of pipe args 16
Max active pipe reservations 16
Max pipe packet size 4244635648 (3.953GiB)
Local memory type Local
Local memory size 65536 (64KiB)
Local memory syze per CU (AMD) 65536 (64KiB)
Local memory banks (AMD) 32
Max number of constant args 8
Max constant buffer size 4244635648 (3.953GiB)
Preferred constant buffer size (AMD) 16384 (16KiB)
Max size of kernel argument 1024
Queue properties (on host)
Out-of-order execution No
Profiling Yes
Queue properties (on device)
Out-of-order execution Yes
Profiling Yes
Preferred size 262144 (256KiB)
Max size 8388608 (8MiB)
Max queues on device 1
Max events on device 1024
Prefer user sync for interop Yes
Number of P2P devices (AMD) 0
P2P devices (AMD) <printDeviceInfo:144: get
number of CL_DEVICE_P2P_DEVICES_AMD : error -30>
Profiling timer resolution 1ns
Profiling timer offset since Epoch (AMD) 1587043647006106515ns (Thu
Apr 16 06:27:27 2020)
Execution capabilities
Run OpenCL kernels Yes
Run native kernels No
Thread trace supported (AMD) Yes
Number of async queues (AMD) 4
Max real-time compute queues (AMD) 0
Max real-time compute units (AMD) 0
printf() buffer size 4194304 (4MiB)
Built-in kernels
Device Extensions cl_khr_fp64
cl_khr_global_int32_base_atomics cl_khr_global_int32_extended_atomics
cl_khr_local_int32_base_atomics cl_khr_local_int32_extended_atomics
cl_khr_int64_base_atomics cl_khr_int64_extended_atomics cl_khr_3d_image_writes
cl_khr_byte_addressable_store cl_khr_fp16 cl_khr_gl_sharing
cl_khr_gl_depth_images cl_amd_device_attribute_query cl_amd_media_ops
cl_amd_media_ops2 cl_khr_image2d_from_buffer cl_khr_subgroups cl_khr_gl_event
cl_khr_depth_images cl_khr_mipmap_image cl_khr_mipmap_image_writes
cl_amd_copy_buffer_p2p
NULL platform behavior
clGetPlatformInfo(NULL, CL_PLATFORM_NAME, ...) No platform
clGetDeviceIDs(NULL, CL_DEVICE_TYPE_ALL, ...) No platform
clCreateContext(NULL, ...) [default] No platform
clCreateContext(NULL, ...) [other] Success [MESA]
clCreateContextFromType(NULL, CL_DEVICE_TYPE_DEFAULT) Success (1)
Platform Name Clover
Device Name AMD Radeon RX 5700 (NAVI10,
DRM 3.33.0, 5.3.0-46-generic, LLVM 9.0.1)
clCreateContextFromType(NULL, CL_DEVICE_TYPE_CPU) No devices found in
platform
clCreateContextFromType(NULL, CL_DEVICE_TYPE_GPU) Success (1)
Platform Name Clover
Device Name AMD Radeon RX 5700 (NAVI10,
DRM 3.33.0, 5.3.0-46-generic, LLVM 9.0.1)
clCreateContextFromType(NULL, CL_DEVICE_TYPE_ACCELERATOR) No devices found
in platform
clCreateContextFromType(NULL, CL_DEVICE_TYPE_CUSTOM) No devices found in
platform
clCreateContextFromType(NULL, CL_DEVICE_TYPE_ALL) Success (1)
Platform Name Clover
Device Name AMD Radeon RX 5700 (NAVI10,
DRM 3.33.0, 5.3.0-46-generic, LLVM 9.0.1)
```
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