[Bug 109477] [regression, bisected] [i915] setting initial watermarks on gen 7 IVYBRIDGE causes blank lines on monitor

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=109477

--- Comment #18 from Andrea <andreatclist at gmail.com> ---
Thanks for the help. Attached (2019-05-08*) the requested info before and after
3e869fd34856.
Also attached the same info if I do "echo '12 0 0 0' >
/sys/kernel/debug/dri/0/i915_pri_wm_latency", and with igfx_off.

The issue disappears either:
1) before 3e869fd34856
2) with echo '12 ...'
3) by disabling DMA remapping (i.e., adding intel_iommu=igfx_off)

If it helps, the DMAR output extracted from dmesg:
[    0.002921] ACPI: DMAR 0x00000000DAFDB000 0000B8 (v01 INTEL  SNB     
00000001 INTL 00000001)
[    0.243778] DMAR: Disable GFX device mapping
[    0.391075] DMAR: Host address width 36
[    0.391079] DMAR: DRHD base: 0x000000fed90000 flags: 0x0
[    0.391089] DMAR: dmar0: reg_base_addr fed90000 ver 1:0 cap c0000020e60262
ecap f0101a
[    0.391093] DMAR: DRHD base: 0x000000fed91000 flags: 0x1
[    0.391099] DMAR: dmar1: reg_base_addr fed91000 ver 1:0 cap c9008020660262
ecap f0105a
[    0.391103] DMAR: RMRR base: 0x000000da43c000 end: 0x000000da452fff
[    0.391106] DMAR: RMRR base: 0x000000db800000 end: 0x000000df9fffff
[    0.391116] DMAR: No ATSR found
[    0.391165] DMAR: dmar1: Using Queued invalidation
[    0.391178] DMAR: Setting RMRR:
[    0.391242] DMAR: Setting identity map for device 0000:00:14.0 [0xda43c000 -
0xda452fff]
[    0.391313] DMAR: Setting identity map for device 0000:00:1a.0 [0xda43c000 -
0xda452fff]
[    0.391403] DMAR: Setting identity map for device 0000:00:1d.0 [0xda43c000 -
0xda452fff]
[    0.391420] DMAR: Prepare 0-16MiB unity mapping for LPC
[    0.391477] DMAR: Setting identity map for device 0000:00:1f.0 [0x0 -
0xffffff]
[    0.391632] DMAR: Intel(R) Virtualization Technology for Directed I/O

And without igfx_off:
[    0.003155] ACPI: DMAR 0x00000000DAFDB000 0000B8 (v01 INTEL  SNB     
00000001 INTL 00000001)
[    0.391918] DMAR: Host address width 36
[    0.391923] DMAR: DRHD base: 0x000000fed90000 flags: 0x0
[    0.391932] DMAR: dmar0: reg_base_addr fed90000 ver 1:0 cap c0000020e60262
ecap f0101a
[    0.391935] DMAR: DRHD base: 0x000000fed91000 flags: 0x1
[    0.391942] DMAR: dmar1: reg_base_addr fed91000 ver 1:0 cap c9008020660262
ecap f0105a
[    0.391946] DMAR: RMRR base: 0x000000da43c000 end: 0x000000da452fff
[    0.391949] DMAR: RMRR base: 0x000000db800000 end: 0x000000df9fffff
[    0.391959] DMAR: No ATSR found
[    0.392008] DMAR: dmar0: Using Queued invalidation
[    0.392018] DMAR: dmar1: Using Queued invalidation
[    0.392255] DMAR: Setting RMRR:
[    0.392320] DMAR: Setting identity map for device 0000:00:02.0 [0xdb800000 -
0xdf9fffff]
[    0.392878] DMAR: Setting identity map for device 0000:00:14.0 [0xda43c000 -
0xda452fff]
[    0.392964] DMAR: Setting identity map for device 0000:00:1a.0 [0xda43c000 -
0xda452fff]
[    0.393031] DMAR: Setting identity map for device 0000:00:1d.0 [0xda43c000 -
0xda452fff]
[    0.393047] DMAR: Prepare 0-16MiB unity mapping for LPC
[    0.393103] DMAR: Setting identity map for device 0000:00:1f.0 [0x0 -
0xffffff]
[    0.393500] DMAR: Intel(R) Virtualization Technology for Directed I/O
[    0.415290] [drm] DMAR active, disabling use of stolen memory

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