Public bug reported: 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 :/ ** Affects: linux (Ubuntu) Importance: Undecided Status: Incomplete -- 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
