Did this issue start happening after an update/upgrade? Was there a prior kernel version where you were not having this particular problem?
Would it be possible for you to test the latest upstream kernel? Refer to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest v4.17 kernel[0]. If this bug is fixed in the mainline kernel, please add the following tag 'kernel-fixed-upstream'. If the mainline kernel does not fix this bug, please add the tag: 'kernel-bug-exists-upstream'. Once testing of the upstream kernel is complete, please mark this bug as "Confirmed". Thanks in advance. [0] http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.17-rc7 ** Changed in: linux (Ubuntu) Importance: Undecided => Medium -- 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/1774425 Title: i915 driver limits virtual resolution to 8192x8192 Status in linux package in Ubuntu: Incomplete Bug description: I have an Intel Iris Pro 580 in my Intel Skull Canyon NUC6I7KYK, a nice little device that has 3 video outputs: * HDMI 2.0 * Mini DisplayPort * Thunderbolt USB-C The product specifications states that the device is able to output three 4K signals. Unfortunately, whenever I tried this in Ubuntu it failed, without any clear error message. After fiddling with other DEs, Kubuntu told me the virtual resolution was not supported. And indeed, as soon as I limited the virtual resolution of the 3 screens to fit in 8192x8192 pixels, all screens worked. Apparently, the i915 driver (in "drivers/gpu/drm/i915/intel_display.c") has not been updated for newer devices when reporting the maximum resolution. As you can see here: https://github.com/torvalds/linux/blob/master/drivers/gpu/drm/i915/intel_display.c#L14671 Only GEN_2 & GEN_3 are checked for, but since the 7th generation max virtual resolutions of 16384x16384 are supported. This issue has been reported to the i915 maintainers a few times, but nothing has changed yet :/ To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1774425/+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
