** Changed in: linux (Ubuntu)
Status: In Progress => Incomplete
** Changed in: linux (Ubuntu Wily)
Status: In Progress => Incomplete
** Changed in: linux (Ubuntu)
Assignee: Joseph Salisbury (jsalisbury) => (unassigned)
** Changed in: linux (Ubuntu Wily)
Assignee: Joseph Salisbury (jsalisbury) => (unassigned)
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https://bugs.launchpad.net/bugs/1536567
Title:
i915 stop working after linux 4.2.0-21-generic
Status in linux package in Ubuntu:
Incomplete
Status in linux source package in Wily:
Incomplete
Bug description:
Hello,
After updating the linux kernel of my Ubuntu 15.10 from 4.2.0-21 to 4.2.0.22
I was unable to get to XFCE and slim login manager, I was stuck on a black
screen
with nothing displayed (no text/graphics). Same issue with latest 4.2.0.25.
When I go back to 4.2.0-21 everything is working perfectly.
So something is "broken" with i915 module starting 4.2.0.22 and newer.
After some research online, I managed to make it work even with kernel 4.2.25
by doing this vodoo magic magic. It's not clear what made it work ;-P
# /etc/default/grub
GRUB_CMDLINE_LINUX="libata.force=noncq quirks.mbp_force_ahci=1
acpi_backlight=vendor apple_bl.use_gmux=1 reboot=pci i915.enable_ips=0
i915.i915_enable_fbc=1 i915.i915_enable_rc6=1 i915.lvds_channel_mode=2
i915.modeset=1 i915.lvds_use_ssc=0 intel_pstate=disable"
# /etc/modprobe.d/i915.conf
options i915 semaphores=1
# /etc/modprobe.d/blacklist
blacklist intel_pstate
reboot
lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 15.10
Release: 15.10
Codename: wily
uname -a
Linux **** 4.2.0-25-generic #30-Ubuntu SMP Mon Jan 18 12:31:50 UTC 2016
x86_64 x86_64 x86_64 GNU/Linux
dmidecode -s system-product-name
Macmini7,1
lspci -vv
00:02.0 VGA compatible controller: Intel Corporation Haswell-ULT Integrated
Graphics Controller (rev 09) (prog-if 00 [VGA controller])
Subsystem: Apple Inc. Device 0141
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping- SERR- FastB2B- DisINTx+
Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort-
<TAbort- <MAbort- >SERR- <PERR- INTx-
Latency: 0
Interrupt: pin A routed to IRQ 56
Region 0: Memory at a0000000 (64-bit, non-prefetchable) [size=4M]
Region 2: Memory at 90000000 (64-bit, prefetchable) [size=256M]
Region 4: I/O ports at 2000 [size=64]
Expansion ROM at <unassigned> [disabled]
Capabilities: [90] MSI: Enable+ Count=1/1 Maskable- 64bit-
Address: fee00018 Data: 0000
Capabilities: [d0] Power Management version 2
Flags: PMEClk- DSI+ D1- D2- AuxCurrent=0mA
PME(D0-,D1-,D2-,D3hot-,D3cold-)
Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
Capabilities: [a4] PCI Advanced Features
AFCap: TP+ FLR+
AFCtrl: FLR-
AFStatus: TP-
Kernel driver in use: i915
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