From: Adam Jackson <ajax@redhat.com>
To: intel-gfx@lists.freedesktop.org
Subject: [PATCH 0/2] Automatic 6bpc dither for DisplayPort
Date: Mon, 10 Oct 2011 16:33:33 -0400 [thread overview]
Message-ID: <1318278815-31492-1-git-send-email-ajax@redhat.com> (raw)
This fixes a rather irritating limitation of active dp->foo converters.
Many such (including all DP->VGA chips I can find on the market) come
equipped with only 2 DP lanes, which clips your dotclock to 144MHz at
8bpc. Of the standard DMT modes, that means you lose 1600x1200@60 and
above. Since these adaptors are marketed as supporting 1920x1200, we
might as well make that work, otherwise it's the driver that comes
out looking bad.
Granted you'll end up with 6bpc, which is hideous, but you're using
VGA so you don't get to complain about image quality.
Tested with a DP->VGA converter on an HP LP2480zx.
- ajax
next reply other threads:[~2011-10-10 20:33 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-10-10 20:33 Adam Jackson [this message]
2011-10-10 20:33 ` [PATCH 1/2] drm/i915: intel_choose_pipe_bpp_dither messages should be DRM_DEBUG_KMS Adam Jackson
2011-10-10 20:33 ` [PATCH 2/2] drm/i915/dp: Dither down to 6bpc if it makes the mode fit Adam Jackson
2011-10-25 16:25 ` [PATCH 0/2] Automatic 6bpc dither for DisplayPort Adam Jackson
2011-10-25 18:25 ` Keith Packard
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