Created attachment 124882 [details] The glitch with gedit Sometimes the following graphics glitch is triggered where the screen starts moving/rotating rapidly. See attachment or https://i.imgur.com/u6j5auo.gif (gedit on LXDE). This is triggered semi-randomly while using specific apps like Kate, gEdit, gVim, leafpad, embedded console inside Dolphin, KDevelop and rarely with Konsole. Also triggered for a few split-seconds when I move the mouse when in fullscreen mode in VLC but stabilises quickly. However, everything is stable when I just use Chrome or Firefox, LXTerminal, Clementine and Code::Blocks, even for hours. Whenever this is triggered, it can sometimes be fixed when I switch to desktop or Chrome or a different app while closing the trigger-er app while other times, rebooting is the only way. Sometimes (rarely) the screen becomes completely black after a while, with key-presses and mouse movements revealing the screen for split-seconds which allows me to properly shutdown/restart the laptop. I've tried to Google the problem with no results, I'm not even sure what to search for. Some system details: OS: Lubuntu 16.04 Kernel (uname -r): 4.4.0-28-generic Laptop: Lenovo G50-80 with Intel 5500 Integrated graphics chip (Broadwell-U Integrated Graphics, inside Core i3-5005U) Relevant lspci block: 00:02.0 VGA compatible controller: Intel Corporation Broadwell-U Integrated Graphics (rev 09) (prog-if 00 [VGA controller]) Subsystem: Lenovo Broadwell-U Integrated Graphics Flags: bus master, fast devsel, latency 0, IRQ 48 Memory at c0000000 (64-bit, non-prefetchable) [size=16M] Memory at b0000000 (64-bit, prefetchable) [size=256M] I/O ports at 4000 [size=64] Expansion ROM at <unassigned> [disabled] Capabilities: [90] MSI: Enable+ Count=1/1 Maskable- 64bit- Capabilities: [d0] Power Management version 2 Capabilities: [a4] PCI Advanced Features Kernel driver in use: i915 Kernel modules: i915 Resolution from xrandr --verbose: 1366x768 (0x47) 72.330MHz -HSync -VSync *current +preferred h: width 1366 start 1414 end 1446 total 1526 skew 0 clock 47.40KHz v: height 768 start 770 end 775 total 790 clock 60.00Hz
Amish, can you attach some logs such as kernel and xorg? please also add drm.debug=14 in your boot command line.
Created attachment 124901 [details] kernel log with drm.debug=14
Created attachment 124902 [details] Xorg log from /var/log/Xorg.0.log
Added the kernel log and xorg log. The kernel log (it's dmesg, right?) is shortly after the glitch triggered while using Kate, where again the screen became unstable and started rolling. After closing Kate, the screen stabilised.
Can someone please help ?
Bump...
this right dmesg is kernel module, but getting from the boot time is better :) Checking on your xorg.log, it looks like "Intel" module cannot be found (or loaded). do you have intel_drv.so located in /usr/lib/xorg/modules/drivers/? BTW did you encounter this issue after an update of Ubuntu or a fresh Install of 16.04? you may have a look here http://askubuntu.com/questions/80914/how-reinstall-the-default-graphics-drivers (don't forget to restart your system since unity --restart is deprecated)
(In reply to yann from comment #7) > this right dmesg is kernel module, but getting from the boot time is better > :) dmesg is kernel log (not module ;)
(In reply to yann from comment #7) > dmesg is kernel log, but getting from the boot time is better How do I obtain it ? > do you have intel_drv.so located in /usr/lib/xorg/modules/drivers/? No, I don't > BTW did you encounter this issue after an update of Ubuntu or a fresh Install of 16.04? This is a fresh install on a new laptop. Surprisingly, the package "xserver-xorg-video-intel" was not installed... However, other than the occasional glitch, I have been able to watch HD videos and play games fine. I've reinstalled the drivers. I will report after a restart. Thank you for helping me out. :)
After about a day of using my laptop after installing `xserver-xorg-video-intel` and reinstalling other graphics component, I haven't been able to trigger the glitch at all. A bit digging revealed this: http://ubuntuforums.org/showthread.php?t=2324014 Lubuntu 16.04, the LXDE flavor decided to not include the above package for some reason, though after installing it manually, the problem at hand could be considered resolved. Although, while playing AssaultCube, I did notice some flickering, but that is something I can live with. P.S. I hope I have selected the appropriate status
Thanks Amish. If you want please feel free to open another bug for the flashing issue you are seeing. concerning the kernel log, you may extend current log buffer size with log_buf_len=4M on your command line (this is a ring buffer).
Use of freedesktop.org services, including Bugzilla, is subject to our Code of Conduct. How we collect and use information is described in our Privacy Policy.