touch-packages team mailing list archive

[flux242 <flux242@xxxxxxxxx>]

patch https://patchwork.freedesktop.org/patch/66697/ DOESN'T solve the
flickering problem on my computer.

What I did:
1. installed generic kernel and headers from http://kernel.ubuntu.com/~kernel-ppa/mainline/drm-intel-nightly/2015-12-24-wily/
2. get the sources from the git://anongit.freedesktop.org/drm-intel branch drm-intel-nightly (commit number: ec0382c73cb1adc972bebdd94afad3f0ea117114)
3. applied the patch https://patchwork.freedesktop.org/patch/66697/
4. compiled the i915 driver and installed it:

mykern=${1:-$(uname -r)}
cp /usr/src/linux-headers-$mykern/Module.symvers .

# Prep tree
cp /boot/config-$mykern ./.config
make oldconfig
make prepare
make modules_prepare

# Build only the needed directories
make SUBDIRS=drivers/gpu/drm/i915 modules
[ -s /lib/modules/$mykern/kernel/drivers/gpu/drm/i915/i915.ko.orig ] || sudo cp /lib/modules/$mykern/kernel/drivers/gpu/drm/i915/i915.ko{,.orig}
sudo cp drivers/gpu/drm/i915/i915.ko /lib/modules/$mykern/kernel/drivers/gpu/drm/i915/
5. reboot

But. Now with the kernel 4.4.xx if I run 'xset dpms force off' just
after the boot then the flicker is gone.

grep of the last boot syslog:
$ grep drm /tmp/syslog 
Dec 24 11:29:49 chrome kernel: [    2.028119] [drm] Initialized drm 1.1.0 20060810
Dec 24 11:29:49 chrome kernel: [    2.066980] [drm] Memory usable by graphics device = 4096M
Dec 24 11:29:49 chrome kernel: [    2.066985] [drm] Replacing VGA console driver
Dec 24 11:29:49 chrome kernel: [    2.067495] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
Dec 24 11:29:49 chrome kernel: [    2.067498] [drm] Driver supports precise vblank timestamp query.
Dec 24 11:29:49 chrome kernel: [    2.067501] [drm] failed to find VBIOS tables
Dec 24 11:29:49 chrome kernel: [    2.210886] [drm] Initialized i915 1.6.0 20151218 for 0000:00:02.0 on minor 0
Dec 24 11:29:49 chrome kernel: [    2.211478] fbcon: inteldrmfb (fb0) is primary device
Dec 24 11:29:49 chrome kernel: [    3.021978] [drm:intel_dp_link_training_clock_recovery [i915]] *ERROR* failed to enable link training
Dec 24 11:29:49 chrome kernel: [    3.025516] [drm:intel_dp_start_link_train [i915]] *ERROR* failed to start channel equalization
Dec 24 11:29:49 chrome kernel: [    3.206466] i915 0000:00:02.0: fb0: inteldrmfb frame buffer device
Dec 24 11:30:13 chrome kernel: [   29.162270] [drm:intel_dp_link_training_clock_recovery [i915]] *ERROR* failed to enable link training

-- 
You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to libdrm in Ubuntu.
https://bugs.launchpad.net/bugs/1522922

Title:
  Screen flickering in Intel i915 driver

Status in Nouveau Xorg driver:
  Incomplete
Status in libdrm package in Ubuntu:
  Confirmed

Bug description:
  There's an upstream bug reported here
  https://bugs.freedesktop.org/show_bug.cgi?id=91393 that causes screen
  flickering when using the Intel i915 builtin driver (at resolutions
  lower than the maximal one).

  I think that it will be fixed in newer kernel versions, but for the
  time being, as reported here
  https://bugs.freedesktop.org/show_bug.cgi?id=91393#c25 (and as
  personally tested) reverting those two commits fixes the problem.

  Would that be possible to release a fixed version for the 4.2.0
  stream?

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: linux-image-4.2.0-19-generic 4.2.0-19.23
  ProcVersionSignature: Ubuntu 4.2.0-19.23-generic 4.2.6
  Uname: Linux 4.2.0-19-generic x86_64
  ApportVersion: 2.19.1-0ubuntu5
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  bettini    1378 F.... pulseaudio
   /dev/snd/controlC1:  bettini    1378 F.... pulseaudio
  CurrentDesktop: KDE
  Date: Fri Dec  4 19:01:00 2015
  HibernationDevice: RESUME=UUID=7ddbc972-3ad6-40de-9313-2bb9395145f9
  InstallationDate: Installed on 2015-05-08 (210 days ago)
  InstallationMedia: Kubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
  MachineType: Dell Inc. Dell Precision M3800
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.2.0-19-generic root=UUID=dd2c7064-53b9-4720-96ab-5e8a3f2db3ea ro noprompt quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-4.2.0-19-generic N/A
   linux-backports-modules-4.2.0-19-generic  N/A
   linux-firmware                            1.149.3
  SourcePackage: linux
  UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev'
  UpgradeStatus: Upgraded to wily on 2015-11-07 (26 days ago)
  dmi.bios.date: 08/17/2015
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A10
  dmi.board.name: Dell Precision M3800
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A10
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.chassis.version: Not Specified
  dmi.modalias: dmi:bvnDellInc.:bvrA10:bd08/17/2015:svnDellInc.:pnDellPrecisionM3800:pvrA10:rvnDellInc.:rnDellPrecisionM3800:rvrA10:cvnDellInc.:ct8:cvrNotSpecified:
  dmi.product.name: Dell Precision M3800
  dmi.product.version: A10
  dmi.sys.vendor: Dell Inc.

To manage notifications about this bug go to:
https://bugs.launchpad.net/nouveau/+bug/1522922/+subscriptions