[Kernel-packages] [Bug 1774425] Re: i915 driver limits virtual resolution to 8192x8192
https://lkml.org/lkml/2017/12/7/201 tries to raise the limit, but according to https://bugs.freedesktop.org/show_bug.cgi?id=102508#c11 it does not work. Also, Skull Canyon is 6th generation, is it not? See https://www.intel.com/content/www/us/en/nuc/nuc-kit-nuc6i7kyk-features- configurations.html ** Bug watch added: freedesktop.org Bugzilla #102508 https://bugs.freedesktop.org/show_bug.cgi?id=102508 -- 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
[Kernel-packages] [Bug 1774425] Re: i915 driver limits virtual resolution to 8192x8192
See also similar bugs https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/1776260 https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/1714178 Those were treated as if the 8kx8k limit was ok, and the bug was in the compositor which failed to work around that limit. Perhaps this bug could be for the lack of the raised limit when using 7th generation chips, if the limit is really higher there? -- 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
[Kernel-packages] [Bug 1774425] Re: i915 driver limits virtual resolution to 8192x8192
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
