From: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
As the introduced comment admits this is clearly a workaround, but for
me this is the only known way to make my Lenovo X201 work without
flickering and crashing.
Signed-off-by: Uwe Kleine-König <uwe@xxxxxxxxxxxxxxxxx>
[uwe: added changelog, comment and restrict to GEN5]
---
Hello,
as I don't like having to compile my own kernel (which has this workaround) I
suggest to apply this patch until someone with more knowledge than me about
i915 finds the muse and time to work on this.
If applying this patch means that I will become i915 maintainer, then please
don't apply; I'm not ready for this :-)
Best regards
Uwe
drivers/gpu/drm/i915/intel_display.c | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index f0b9aa7a0483..126825c207b3 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -16488,6 +16488,17 @@ int intel_modeset_init(struct drm_device *dev)
} else if (IS_GEN2(dev_priv)) {
dev->mode_config.cursor_width = GEN2_CURSOR_WIDTH;
dev->mode_config.cursor_height = GEN2_CURSOR_HEIGHT;
+ } else if (IS_GEN5(dev_priv)) {
+ /*
+ * actually the hardware should be capable to handle
+ * MAX_CURSOR_{WIDTH,HEIGHT} (i.e. 256), but on some GEN 5
+ * hardware this results in fifo underruns, occasional
+ * hardware lockups and display artifacts.
+ * See https://bugs.freedesktop.org/show_bug.cgi?id=98742 for
+ * more details.
+ */
+ dev->mode_config.cursor_width = 64;
+ dev->mode_config.cursor_height = 64;
} else {
dev->mode_config.cursor_width = MAX_CURSOR_WIDTH;
dev->mode_config.cursor_height = MAX_CURSOR_HEIGHT;
--
2.11.0
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