Date: Fri, 12 Mar 2004 02:14:08 +0700 (KRAT) From: Eugene Grosbein <eugen@grosbein.pp.ru> To: FreeBSD-gnats-submit@FreeBSD.org Subject: kern/64114: [PATCH] bad vertical refresh for console using Radeon 9200 VIVO Message-ID: <200403111914.i2BJE8Ru002617@grosbein.pp.ru> Resent-Message-ID: <200403111920.i2BJKEVR027547@freefall.freebsd.org>
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>Number: 64114
>Category: kern
>Synopsis: [PATCH] bad vertical refresh for console using Radeon 9200 VIVO
>Confidential: no
>Severity: non-critical
>Priority: low
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: change-request
>Submitter-Id: current-users
>Arrival-Date: Thu Mar 11 11:20:14 PST 2004
>Closed-Date:
>Last-Modified:
>Originator: Eugene Grosbein
>Release: FreeBSD 4.9-STABLE i386
>Organization:
Svyaz Service JSC
>Environment:
System: FreeBSD grosbein.pp.ru 4.9-STABLE FreeBSD 4.9-STABLE #6: Fri Mar 12 01:17:55 KRAT 2004 eu@grosbein.pp.ru:/tmp/obj/usr/local/src/sys/DADV i386
Video card: ATI Radeon 9200 VIVO connected to Samsung SyncMaster 510s and TV set.
>Description:
When ATI Radeon 9200 VIVO discovers at boot time that it is connected
to a TV set, it switches initial settings for both of monitor and TV
to 50Hz and decrease a number of scan lines for a monitor too.
Verbose boot shows that vga(4) at stage 2 (see How-To-Repeat)
detects similar settings for initial values and BIOS supplied
(see probe_adapters()/comp_adpregs() in src/sys/dev/fb/vga.c)
and uses ones supplied by BIOS.
At stage 3 there are large differences between that pair of
settings and vga(4) warns:
vga0: vga: WARNING: video mode switching is not fully supported on this adapter
It throws away old good 70Hz mode supplied by BIOS and stays with
that horrible 50Hz initial mode.
>How-To-Repeat:
1. Get ATI Radeon 9200 VIVO.
2. Do not connect it to the TV, connect to the monitor and boot.
You will get familiar 70Hz text mode.
3. Shut down the system, attach TV to the video output and boot.
You will observe 50Hz of vertical frequency from the BIOS POST
stage to FreeBSD multiuser mode and later. And no standard way
to change this (not to mention X Window).
However, Windows 98SE will run DOS Box/fullscreen using standard
70Hz mode with this hardware.
>Fix:
The solution is to make it possible to force usage of BIOS values.
The following patch (for 4.9-STABLE) introduces new kernel option
VGA_PREFER_BIOSMODE. Patched man page vga(4) says:
This option changes default behaviour of the driver when the settings
of the initial video mode differ from BIOS setting for that mode greatly.
By default the driver will ignore BIOS settings. The option forces
it to ignore initial settings and use ones supplied by BIOS.
Try this option if you experience very low refresh rate using
standard video console.
Please adjust language as needed, my English is obviosly poor, sorry.
--- sys/conf/options.i386.orig Sat Mar 6 14:33:55 2004
+++ sys/conf/options.i386 Fri Mar 12 00:48:44 2004
@@ -101,6 +101,7 @@
VGA_NO_MODE_CHANGE opt_vga.h
VGA_SLOW_IOACCESS opt_vga.h
VGA_WIDTH90 opt_vga.h
+VGA_PREFER_BIOSMODE opt_vga.h
VESA opt_vesa.h
VESA_DEBUG opt_vesa.h
--- sys/i386/conf/LINT.orig Sat Mar 6 14:34:13 2004
+++ sys/i386/conf/LINT Fri Mar 12 00:54:21 2004
@@ -1141,6 +1141,11 @@
# The following option probably won't work with the LCD displays.
options VGA_WIDTH90 # support 90 column modes
+# Try the following option if an initial video mode does not satisfy you.
+# The vga driver will prefer BIOS mode settings that are better for some
+# VIVO cards (f.e. ATI Radeon)
+options VGA_PREFER_BIOSMODE
+
# To include support for VESA video modes
options VESA
--- sys/dev/fb/vga.c.orig Thu Mar 11 23:31:38 2004
+++ sys/dev/fb/vga.c Fri Mar 12 01:26:28 2004
@@ -1105,6 +1105,13 @@
rows_offset = adpstate.regs[1] + 1 - mp[1];
break;
+#ifdef VGA_PREFER_BIOSMODE
+ case COMP_DIFFERENT: /* one may prefer BIOS register values */
+ default:
+ bcopy(adpstate2.regs, adpstate.regs, sizeof(adpstate.regs));
+ /* FALL THROUGH */
+#endif
+
case COMP_SIMILAR:
/*
* Not exactly the same, but similar enough to be
@@ -1117,6 +1124,7 @@
adpstate.regs[1] -= rows_offset - 1;
break;
+#ifndef VGA_PREFER_BIOSMODE
case COMP_DIFFERENT:
default:
/*
@@ -1130,6 +1138,7 @@
mode_map[adp->va_initial_mode] = adpstate.regs;
rows_offset = 1;
break;
+#endif
}
}
#endif /* VGA_NO_BIOS || VGA_NO_MODE_CHANGE */
@@ -1379,6 +1388,11 @@
return ENXIO;
adp->va_flags |= V_ADP_REGISTERED;
}
+
+#ifdef VGA_PREFER_BIOSMODE
+ vga_set_mode(adp, adp->va_initial_mode);
+#endif
+
if (vga_sub_configure != NULL)
(*vga_sub_configure)(0);
--- share/man/man4/vga.4.orig Fri Mar 12 01:37:08 2004
+++ share/man/man4/vga.4 Fri Mar 12 01:48:52 2004
@@ -38,6 +38,7 @@
.Cd "options VGA_ALT_SEQACCESS"
.Cd "options VGA_NO_FONT_LOADING"
.Cd "options VGA_NO_MODE_CHANGE"
+.Cd "options VGA_PREFER_BIOSMODE"
.Cd "options VGA_SLOW_IOACCESS"
.Cd "options VGA_WIDTH90"
.Cd "device vga0 at isa? port ?
@@ -82,6 +83,13 @@
You may want to try this option if the mouse pointer is not drawn correctly
or the font does not seem to be loaded properly on the VGA card.
However, it may cause flicker on some systems.
+.It Dv VGA_PREFER_BIOSMODE
+This option changes default behaviour of the driver when the settings
+of the initial video mode differ from BIOS setting for that mode greatly.
+By default the driver will ignore BIOS settings. The option forces
+it to ignore initial settings and use ones supplied by BIOS.
+Try this option if you experience very low refresh rate using
+standard video console.
.It Dv VGA_SLOW_IOACCESS
Older VGA cards may require this option for proper operation.
It makes the driver perform byte-wide I/O to VGA registers and
>Release-Note:
>Audit-Trail:
>Unformatted:
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