* bug (driver i915) in kernel >= 4.9.40
@ 2018-02-09 13:35 Enrico Deotto
2018-02-12 10:13 ` Jani Nikula
0 siblings, 1 reply; 2+ messages in thread
From: Enrico Deotto @ 2018-02-09 13:35 UTC (permalink / raw)
To: intel-gfx
[-- Attachment #1.1.1: Type: text/plain, Size: 2411 bytes --]
Hello,
I'm writing you to get more info about a possible bug we are experiencing on kernel 4.9 (details below). If this is not the proper address please accept my apologies and let me know where I should address my request to.
We are running Linux on a EMX-SKLUP machine (https://www.avalue.com.tw/Product/Industrial-PC/Industrial-Motherboard/Thin-Mini-ITX/EMX-SKLUP_2521 )
This machine mounts a graphics card: Intel® Skylake U SoC integrated Graphics and we are using the i915 driver to drive two screens, one using the HDMI port and the other using the DisplayPort.
We tried different kernels and we noticed the following:
1. Kernel 4.4 --> all versions work like a charm
2. Kernel 4.9 --> all versions before 4.9.30 work. All versions after 4.9.40 have problem with the HDMI port. It simply turns out to be always disconnected when issuing an xrandr. Thus, the screen is simply blank. The DisplayPort connection works perfectly.
We made some narrowing and the problem seems to have been introduced between the following two commits:
· 4.9.30 commit: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git/commit/?h=linux-4.9.y&id=db3fd4527ed32be44cbd8ffa6dd6a301c89d0d6d
· 4.9.40 commit: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git/commit/?h=linux-4.9.y&id=efcfbfb1d8bf756d1b58fe215bf4e419d176435b
· diff of i915 dir: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git/diff/drivers/gpu/drm/i915?h=linux-4.9.y&id=db3fd4527ed32be44cbd8ffa6dd6a301c89d0d6d&id2=efcfbfb1d8bf756d1b58fe215bf4e419d176435b
3. All following kernels have the same problem.
I attach some info to the present email and I am at your disposal for any additional info you may need.
I thank you for any insight you can provide us to solve this issue.
Thanks a lot,
Enrico Deotto
Firmware and Software Manager
GDS / Global Display Solutions Spa
Via Tezze, 20/A - 36073 Cornedo (VI)
ITALY
[cid:image002.png@01D1A7BF.B77C8C00]Italy
M: +39 3920961186
E. e.deotto@gds.com<mailto:e.deotto@gds.com>
W. http://displays.gds.com/<https://urldefense.proofpoint.com/v2/url?u=http-3A__displays.gds.com_&d=DwMFAw&c=GC0NZZhaEw6GOQSjMHI2g15k_drElRoPmOYiK2k0eZ8&r=uepINBU0Dj9IbNKNiA2gpkiuxLsRtZW-KkjUkUzxecQ&m=LshAfsGbvQNY-xYOGLqa99HflhcvC5s9XwjPknKmSfI&s=5p0k7w1gRCODUVp1OOdX-M4sPoCWikJ6UhL-tZYubzw&e=>
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processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 78
model name : Intel(R) Celeron(R) CPU 3955U @ 2.00GHz
stepping : 3
microcode : 0xba
cpu MHz : 485.937
cache size : 2048 KB
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siblings : 2
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power management:
processor : 1
vendor_id : GenuineIntel
cpu family : 6
model : 78
model name : Intel(R) Celeron(R) CPU 3955U @ 2.00GHz
stepping : 3
microcode : 0xba
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cache size : 2048 KB
physical id : 0
siblings : 2
core id : 1
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apicid : 2
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wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx pdpe1gb rdtscp lm constant_tsc arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc aperfmperf eagerfpu pni pclmulqdq dtes64 monitor ds_cpl vmx est tm2 ssse3 sdbg cx16 xtpr pdcm pcid sse4_1 sse4_2 x2apic movbe popcnt tsc_deadline_timer aes xsave rdrand lahf_lm abm 3dnowprefetch ida arat epb invpcid_single pln pts dtherm hwp hwp_notify hwp_act_window hwp_epp intel_pt rsb_ctxsw retpoline kaiser tpr_shadow vnmi flexpriority ept vpid fsgsbase tsc_adjust erms invpcid rdseed smap clflushopt xsaveopt xsavec xgetbv1
bugs : cpu_meltdown spectre_v1 spectre_v2
bogomips : 3983.88
clflush size : 64
cache_alignment : 64
address sizes : 39 bits physical, 48 bits virtual
power management:
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00:1f.6 Ethernet controller: Intel Corporation Ethernet Connection I219-LM (rev 21)
01:00.0 Ethernet controller: Intel Corporation I211 Gigabit Network Connection (rev 03)
02:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Caicos
02:00.1 Audio device: Advanced Micro Devices, Inc. [AMD/ATI] Caicos HDMI Audio [Radeon HD 6400 Series]
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^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: bug (driver i915) in kernel >= 4.9.40
2018-02-09 13:35 bug (driver i915) in kernel >= 4.9.40 Enrico Deotto
@ 2018-02-12 10:13 ` Jani Nikula
0 siblings, 0 replies; 2+ messages in thread
From: Jani Nikula @ 2018-02-12 10:13 UTC (permalink / raw)
To: Enrico Deotto, intel-gfx
On Fri, 09 Feb 2018, Enrico Deotto <E.Deotto@gds.com> wrote:
> I'm writing you to get more info about a possible bug we are
> experiencing on kernel 4.9 (details below). If this is not the proper
> address please accept my apologies and let me know where I should
> address my request to.
Please file a bug at [1], with the info from this mail.
Thanks,
Jani.
[1] https://bugs.freedesktop.org/enter_bug.cgi?product=DRI&component=DRM/Intel
--
Jani Nikula, Intel Open Source Technology Center
_______________________________________________
Intel-gfx mailing list
Intel-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/intel-gfx
^ permalink raw reply [flat|nested] 2+ messages in thread
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2018-02-09 13:35 bug (driver i915) in kernel >= 4.9.40 Enrico Deotto
2018-02-12 10:13 ` Jani Nikula
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