Public bug reported: I have an X220 connected to a dock and via HDMI to an external monitor running bionic. I noticed that anytime that I came back to the machine from a screensaver both displays would flicker hard in certain areas of the screen. The "fix" is to click the affected areas and then the flickering goes away. I believe the X230 I also have is not affected in the same dock but my memory might be wrong here.
Most importantly, I was able to verify that this problem is not present in mainline kernel "5.2.0-999-generic #201905312204 SMP Sat Jun 1 02:07:08 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux" $ sudo lshw -c display *-display description: VGA compatible controller product: 2nd Generation Core Processor Family Integrated Graphics Controller vendor: Intel Corporation physical id: 2 bus info: pci@0000:00:02.0 version: 09 width: 64 bits clock: 33MHz capabilities: msi pm vga_controller bus_master cap_list rom configuration: driver=i915 latency=0 resources: irq:34 memory:f0000000-f03fffff memory:e0000000-efffffff ioport:5000(size=64) memory:c0000-dffff ** Affects: linux (Ubuntu) Importance: Undecided Status: Confirmed ** Tags: bionic kernel-fixed-upstream ** Tags added: kernel-fixed-upstream ** Changed in: linux (Ubuntu) Status: New => Confirmed -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1834222 Title: [i915] flickering after waking up from screensaver (fixed in mainline) Status in linux package in Ubuntu: Confirmed Bug description: I have an X220 connected to a dock and via HDMI to an external monitor running bionic. I noticed that anytime that I came back to the machine from a screensaver both displays would flicker hard in certain areas of the screen. The "fix" is to click the affected areas and then the flickering goes away. I believe the X230 I also have is not affected in the same dock but my memory might be wrong here. Most importantly, I was able to verify that this problem is not present in mainline kernel "5.2.0-999-generic #201905312204 SMP Sat Jun 1 02:07:08 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux" $ sudo lshw -c display *-display description: VGA compatible controller product: 2nd Generation Core Processor Family Integrated Graphics Controller vendor: Intel Corporation physical id: 2 bus info: pci@0000:00:02.0 version: 09 width: 64 bits clock: 33MHz capabilities: msi pm vga_controller bus_master cap_list rom configuration: driver=i915 latency=0 resources: irq:34 memory:f0000000-f03fffff memory:e0000000-efffffff ioport:5000(size=64) memory:c0000-dffff To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1834222/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp