Created attachment 100148 [details] dmesg ==System Environment== -------------------------- Regression: No. Non-working platforms: BDW-Y ==kernel== -------------------------- origin/drm-intel-nightly: 9f53d4f6f55aa0c037f299dbe2986eec9151be9b(fails) drm-intel-nightly: 2014y-05m-28d-00h-00m-47s integration manifest origin/drm-intel-next-queued: 38d811545c61cf188beac860615a08fb32f73eb1(fails) drm/i915/vlv: add pll assertion when disabling DPIO common well origin/drm-intel-fixes: d23db88c3ab233daed18709e3a24d6c95344117f(fails) drm/i915: Prevent negative relocation deltas from wrapping ==Bug detailed description== ----------------------------- Booting with DP->HDMI ,4K monitor can't be lighted up after entering the kernel. But normal monitor can be lighted up successfully, and original Ubuntu Kernel can light up 4K monitor. ==Reproduce steps== ---------------------------- Boot with DP->HDMI 4k monitor.
First, does this work on any Intel platform? There should be no difference here vs. Haswell. Can you please give me more details about the DP->HDMI adapter. We do not currently support HDMI 2.0 which is required for 4k@60FPS. Please also provide output from `xrandr --verbose` (via ssh) if possible.
Created attachment 100428 [details] information of bdwy `xrandr` and `xrandr --verbose`
Created attachment 100429 [details] dmesg of bdwy
Created attachment 100430 [details] information of hsw `xrandr` and `xrandr --verbose`
Created attachment 100431 [details] dmesg of hsw
(In reply to comment #1) > First, does this work on any Intel platform? There should be no difference > here vs. Haswell. > Haswell can light up 4K monitor with the same DP->HDMI adapter and the same kernel. > Can you please give me more details about the DP->HDMI adapter. > > We do not currently support HDMI 2.0 which is required for 4k@60FPS. Please > also provide output from `xrandr --verbose` (via ssh) if possible. I attach the information of output
Latest -nightly still fails to light up DP monitor.
Created attachment 106932 [details] [review] patch 1/2
Created attachment 106933 [details] [review] patch 2/2
Do these 2 patches applied together help?
The machine related to this bug was dead. I tried to reproduce this bug on our new BDW-Y machine, but find DP unable to light up both on 4K monitor and normal monitor. See Bug 85048. I tested it on latest -nightly kernel(1e61c9), the pathchs are inclued in the kernel.
Hi, Now that Bug 85048 is closed, would you mind re-testing this and attach a full dmesg from boot with drm.debug=7? Thanks,
If it still fails could you try the same thing with i915.enable_ips=0 ? -- Damien
Created attachment 110482 [details] dmesg log
Created attachment 110483 [details] dmesg log with i915.enable_ips=0 It works on normal monitor, but still fails on 4K monitor.
Do you get a pic on screen if you set a smaller resolution?
(In reply to Jani Nikula from comment #16) > Do you get a pic on screen if you set a smaller resolution? How can I set a smaller resolution? Would you please teach me a method to do this?
See xrandr --mode option.
The 4K monitor is successfully lighted up whit 3840x2160 mode.
So close this bug.
Closing old verified.
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