Same here with Dell Latitude 131L. Restarting lightdm works, but the
session is gone. It didn't happen on 14.*. I tried to purge lightdm and
then installing it again, but now gpu-manager fails and lightdm doesn't
start:
log_file: /var/log/gpu-manager.log
last_boot_file: /var/lib/ubuntu-drivers-common/last_gfx_boot
new_boot_file: /var/lib/ubuntu-drivers-common/last_gfx_boot
can't access /run/u-d-c-nvidia-was-loaded file
can't access /run/u-d-c-fglrx-was-loaded file
Looking for fglrx modules in /lib/modules/4.4.0-36-generic/updates/dkms
Looking for nvidia modules in /lib/modules/4.4.0-36-generic/updates/dkms
Is nvidia loaded? no
Was nvidia unloaded? no
Is nvidia blacklisted? no
Is fglrx loaded? no
Was fglrx unloaded? no
Is fglrx blacklisted? no
Is intel loaded? no
Is radeon loaded? yes
Is radeon blacklisted? no
Is amdgpu loaded? no
Is amdgpu blacklisted? no
Is nouveau loaded? no
Is nouveau blacklisted? no
Is fglrx kernel module available? no
Is nvidia kernel module available? no
Vendor/Device Id: 1002:5975
BusID "PCI:1@0:5:0"
Is boot vga? yes
Skipping "/dev/dri/card0", driven by "radeon"
Found "/dev/dri/card0", driven by "radeon"
output 0:
LVDS connector
Number of connected outputs for /dev/dri/card0: 1
Skipping "/dev/dri/card0", driven by "radeon"
Skipping "/dev/dri/card0", driven by "radeon"
Does it require offloading? no
last cards number = 1
Has amd? yes
Has intel? no
Has nvidia? no
How many cards? 1
Has the system changed? No
main_arch_path i386-linux-gnu, other_arch_path x86_64-linux-gnu
Current alternative: /usr/lib/i386-linux-gnu/mesa/ld.so.conf
Current core alternative: (null)
Current egl alternative: /usr/lib/i386-linux-gnu/mesa-egl/ld.so.conf
Is nvidia enabled? no
Is nvidia egl enabled? no
Is fglrx enabled? no
Is mesa enabled? yes
Is mesa egl enabled? yes
Is pxpress enabled? no
Is prime enabled? no
Is prime egl enabled? no
Is nvidia available? no
Is nvidia egl available? no
Is fglrx available? no
Is fglrx-core available? no
Is mesa available? yes
Is mesa egl available? yes
Is pxpress available? no
Is prime available? no
Is prime egl available? no
Single card detected
Kernel Module is not loaded
Nothing to do
No change - nothing to do
lspci output:
01:05.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI]
RS482M [Mobility Radeon Xpress 200] (prog-if 00 [VGA
controller])
Subsystem: Dell RS482M [Mobility Radeon Xpress 200]
Flags: bus master, 66MHz, medium devsel, latency 66, IRQ 17
Memory at c0000000 (32-bit, prefetchable) [size=256M]
I/O ports at 9000 [size=256]
Memory at b0100000 (32-bit, non-prefetchable) [size=64K]
[virtual] Expansion ROM at b0120000 [disabled] [size=128K]
Capabilities: [50] Power Management version 2
Kernel driver in use: radeon
Kernel modules: radeonfb, radeon
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https://bugs.launchpad.net/bugs/1591426
Title:
LCD remains off once it is turned off for power saving
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1591426/+subscriptions
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