Just wanted to chime in and confirm same bug on same machine:
Thinkpad x260
Processor: Intel® Core™ i7-6500U CPU @ 2.50GHz × 4
Graphics: Gallium 0.4 on llvmpipe (LLVM 3.8, 256 bits)
I'm running a 1 day old Ubuntu 16.04.
I have experienced this crash on the stock kernel, 4.6.9 and 4.6.3
My steps to reproduce:
* plug in HDMI to a 4K external display and set display to full resolution (this will only have a frame rate of 30Hz due to a limitation in HDMI standard)
* turn off laptop monitor
* plug in DP to *the same* external display
* Set new configuration where HDMI if off and DP is on. (this will be at 60Hz)
* screen goes blank on both HDMI and DP source. reverts to last configuration because of crash.
I believe it is the combination of 4K display in full resolution *and* 60hz. This would be why the crash is only seen with DP at full resolution.
Hi first post here...
Just wanted to chime in and confirm same bug on same machine:
Thinkpad x260
Processor: Intel® Core™ i7-6500U CPU @ 2.50GHz × 4
Graphics: Gallium 0.4 on llvmpipe (LLVM 3.8, 256 bits)
In order to try and fix the bug I have added the repo: ppa.launchpad. net/oibaf/ graphics- drivers/ ubuntu
http://
Before this change, the system reported Graphics: Intel Skylake HD Graphics 520
I'm running a 1 day old Ubuntu 16.04.
I have experienced this crash on the stock kernel, 4.6.9 and 4.6.3
My steps to reproduce:
* plug in HDMI to a 4K external display and set display to full resolution (this will only have a frame rate of 30Hz due to a limitation in HDMI standard)
* turn off laptop monitor
* plug in DP to *the same* external display
* Set new configuration where HDMI if off and DP is on. (this will be at 60Hz)
* screen goes blank on both HDMI and DP source. reverts to last configuration because of crash.
I believe it is the combination of 4K display in full resolution *and* 60hz. This would be why the crash is only seen with DP at full resolution.
last crash report with kernel 4.6.3: COD/linux/ drivers/ gpu/drm/ i915/intel_ display. c:13938 skl_max_ scale.part. 99+0x6d/ 0x80 [i915] ONCE(!crtc_ clock || cdclk < crtc_clock) codec_realtek snd_hda_ codec_generic snd_soc_sst_match intel_rapl snd_soc_core x86_pkg_ temp_thermal snd_compress inte generic #201606241434 20F6006XMD, BIOS R02ET44W (1.17 ) 01/25/2016 373>] dump_stack+ 0x63/0x90 93b>] __warn+0xcb/0xf0 9bf>] warn_slowpath_ fmt+0x5f/ 0x80 46d>] skl_max_ scale.part. 99+0x6d/ 0x80 [i915] 540>] intel_check_ primary_ plane+0xc0/ 0xe0 [i915] 66a>] ? intel_ddi_ compute_ config+ 0x5a/0xc0 [i915] 3fe>] intel_plane_ atomic_ check+0x12e/ 0x1f0 [i915] ff8>] drm_atomic_ helper_ check_planes+ 0x48/0x1d0 [drm_kms_helper] d02>] intel_atomic_ check+0x172/ 0x830 [i915] e11>] drm_atomic_ check_only+ 0x181/0x600 [drm] 657>] ? drm_atomic_ set_crtc_ for_connector+ 0x57/0xe0 [drm] 2a7>] drm_atomic_ commit+ 0x17/0x60 [drm] 03a>] drm_atomic_ helper_ set_config+ 0x7a/0xb0 [drm_kms_helper] b52>] drm_mode_ set_config_ internal+ 0x62/0x100 [drm] af0>] drm_mode_ setcrtc+ 0x3e0/0x500 [drm] aa2>] drm_ioctl+ 0x152/0x540 [drm] 710>] ? drm_mode_ setplane+ 0x1b0/0x1b0 [drm] 9f1>] do_vfs_ ioctl+0xa1/ 0x5b0 961>] ? __set_task_ blocked+ 0x41/0xa0 2e6>] ? __set_current_ blocked+ 0x36/0x60 f79>] SyS_ioctl+0x79/0x90 ab6>] entry_SYSCALL_ 64_fastpath+ 0x1e/0xa8 cpu_fifo_ underrun_ irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun
Jul 06 19:32:14 emil-workpad kernel: ------------[ cut here ]------------
Jul 06 19:32:14 emil-workpad kernel: WARNING: CPU: 0 PID: 986 at /home/kernel/
Jul 06 19:32:14 emil-workpad kernel: WARN_ON_
Jul 06 19:32:14 emil-workpad kernel: Modules linked in:
Jul 06 19:32:14 emil-workpad kernel: rfcomm bnep arc4 snd_soc_skl snd_soc_skl_ipc snd_hda_codec_hdmi snd_soc_sst_ipc snd_soc_sst_dsp snd_hda_ext_core snd_hda_
Jul 06 19:32:14 emil-workpad kernel: hid_lenovo usbhid hid rtsx_pci_sdmmc crct10dif_pclmul crc32_pclmul ghash_clmulni_intel i915 aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper cryptd i2c_algo_bit drm_kms_helper syscopyarea sysfillrect e1000e sysimgblt psmouse f
Jul 06 19:32:14 emil-workpad kernel: CPU: 0 PID: 986 Comm: Xorg Tainted: G W 4.6.3-040603-
Jul 06 19:32:14 emil-workpad kernel: Hardware name: LENOVO 20F6006XMD/
Jul 06 19:32:14 emil-workpad kernel: 0000000000000286 00000000eeed4400 ffff8802148b7a50 ffffffff813f3373
Jul 06 19:32:14 emil-workpad kernel: ffff8802148b7aa0 0000000000000000 ffff8802148b7a90 ffffffff8108293b
Jul 06 19:32:14 emil-workpad kernel: 00003672c02dada0 ffff8802183dba80 ffff880035c4e800 ffff8800b29cb000
Jul 06 19:32:14 emil-workpad kernel: Call Trace:
Jul 06 19:32:14 emil-workpad kernel: [<ffffffff813f3
Jul 06 19:32:14 emil-workpad kernel: [<ffffffff81082
Jul 06 19:32:14 emil-workpad kernel: [<ffffffff81082
Jul 06 19:32:14 emil-workpad kernel: [<ffffffffc02a8
Jul 06 19:32:14 emil-workpad kernel: [<ffffffffc02a8
Jul 06 19:32:14 emil-workpad kernel: [<ffffffffc02cf
Jul 06 19:32:14 emil-workpad kernel: [<ffffffffc029a
Jul 06 19:32:14 emil-workpad kernel: [<ffffffffc017e
Jul 06 19:32:14 emil-workpad kernel: [<ffffffffc02b4
Jul 06 19:32:14 emil-workpad kernel: [<ffffffffc0084
Jul 06 19:32:14 emil-workpad kernel: [<ffffffffc0084
Jul 06 19:32:14 emil-workpad kernel: [<ffffffffc0085
Jul 06 19:32:14 emil-workpad kernel: [<ffffffffc0181
Jul 06 19:32:14 emil-workpad kernel: [<ffffffffc0074
Jul 06 19:32:14 emil-workpad kernel: [<ffffffffc0078
Jul 06 19:32:14 emil-workpad kernel: [<ffffffffc0069
Jul 06 19:32:14 emil-workpad kernel: [<ffffffffc0078
Jul 06 19:32:14 emil-workpad kernel: [<ffffffff81237
Jul 06 19:32:14 emil-workpad kernel: [<ffffffff81090
Jul 06 19:32:14 emil-workpad kernel: [<ffffffff81093
Jul 06 19:32:14 emil-workpad kernel: [<ffffffff81237
Jul 06 19:32:14 emil-workpad kernel: [<ffffffff81845
Jul 06 19:32:14 emil-workpad kernel: ---[ end trace dce1bcd4b56b9a53 ]---
Jul 06 19:32:14 emil-workpad kernel: [drm:intel_