<html> <head> <base href="https://bugs.freedesktop.org/"> </head> <body> <div> <a class="bz_bug_link bz_status_REOPENED " title="REOPENED - [regression, bisected] [i915] setting initial watermarks on gen 7 IVYBRIDGE causes blank lines on monitor" href="https://bugs.freedesktop.org/show_bug.cgi?id=109477#c18">Comment # 18</a> on <a class="bz_bug_link bz_status_REOPENED " title="REOPENED - [regression, bisected] [i915] setting initial watermarks on gen 7 IVYBRIDGE causes blank lines on monitor" href="https://bugs.freedesktop.org/show_bug.cgi?id=109477">bug 109477</a> from <a class="email" href="mailto:andreatclist@gmail.com" title="Andrea <andreatclist@gmail.com>"> Andrea</a> <pre>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</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the QA Contact for the bug.</li> <li>You are the assignee for the bug.</li> <li>You are on the CC list for the bug.</li> </ul> </body> </html>