From: bugzilla-daemon@freedesktop.org
To: dri-devel@lists.freedesktop.org
Subject: [Bug 91789] MST (multi stream) with Asus PQ321 drm_dp_calc_pbn_mode() fails
Date: Fri, 28 Aug 2015 08:12:55 +0000 [thread overview]
Message-ID: <bug-91789-502@http.bugs.freedesktop.org/> (raw)
[-- Attachment #1.1: Type: text/plain, Size: 1050 bytes --]
https://bugs.freedesktop.org/show_bug.cgi?id=91789
Bug ID: 91789
Summary: MST (multi stream) with Asus PQ321
drm_dp_calc_pbn_mode() fails
Product: DRI
Version: unspecified
Hardware: x86 (IA32)
OS: Linux (All)
Status: NEW
Severity: normal
Priority: medium
Component: General
Assignee: dri-devel@lists.freedesktop.org
Reporter: Peter.Blum@lxco.com
If a Asus monitor PQ321 is used in MST mode it gets no signal.
This is because the function drm_dp_calc_pbn_mode() in drm_dp_mst_topology.c
returns a bad pixel bandwith number for the mode
Modeline 131:"1920x2160" 60 297000 1920 2008 2052 2200 2160 2168 2178 2250 0x48
0x5
The function return 8 and not the correct value of 1063.
Using simple u32 arithmetic in drm_dp_calc_pbn_mode() the monitor works fine.
I'm not sure if unsigned 32 bit would overflow in some cases.
--
You are receiving this mail because:
You are the assignee for the bug.
[-- Attachment #1.2: Type: text/html, Size: 2283 bytes --]
[-- Attachment #2: Type: text/plain, Size: 159 bytes --]
_______________________________________________
dri-devel mailing list
dri-devel@lists.freedesktop.org
http://lists.freedesktop.org/mailman/listinfo/dri-devel
next reply other threads:[~2015-08-28 8:12 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-08-28 8:12 bugzilla-daemon [this message]
2016-04-25 12:24 ` [Bug 91789] MST (multi stream) with Asus PQ321 drm_dp_calc_pbn_mode() fails bugzilla-daemon
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=bug-91789-502@http.bugs.freedesktop.org/ \
--to=bugzilla-daemon@freedesktop.org \
--cc=dri-devel@lists.freedesktop.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.