Chrontel 7036 chip driver for ubuntu

[waterhead]

Yeah, I had my problems with this patch too so I tried to apply it manually with Gedit and it worked.

I never thought of doing that. I think I may give that a try.

And sorry if my english sucks. ^^

It's better than my deutsch!. My Great-Grandfather was from Deutschland (my name is Schmidt). I didn't go to a church, I went to a Kirche. But, I only know a few swear words in deutsch.

Anyway, if you have any trouble installing the CrystalHD driver, I can help with that. There is a patch for that driver too.

[daniel-holz91]

I never thought of doing that. I think I may give that a try.

You can do that but the patch on my blog should do the same. If you save time you could try this compiled and patched driver. http://ubuntuone.com/05i4CLB81NmOy8CucxyZL5

It's better than my deutsch!. My Great-Grandfather was from Deutschland (my name is Schmidt). I didn't go to a church, I went to a Kirche. But, I only know a few swear words in deutsch.

Yeah Schmidt is very, very, very, very german. It's the german Smith.

Anyway, if you have any trouble installing the CrystalHD driver, I can help with that. There is a patch for that driver too.

Thanks but I only have the cheap version of the WeTab which lacks the CrystalHD. But I already found a way to play hd-videos without it.

[waterhead]

I wanted to get this to work on 13.10 before trying it on 14.04. I first tried manually adding the WeTab patch. But when I compiled it I got an error. So I then just applied the patch from daniel-holz91. I also had to make the ch7036_start file executable before it would work.

The picture is a bit fuzzy, but I didn't yet try to make any adjustments via the config file.

Next I'll try it on Ubuntu 14.04.

[daniel-holz91]

Yeah for some reasons the daemon gets no EDID-information from the external screen and reduces its resolution to 480p. With the correct "-E" parameter it should display at least 1366x768. What I still not got working is to get it autostarting. fstab didn't work (boot time increased dramaticly, daemon didn't start) and starting it through lightDM caused a black screen.

[waterhead]

I've worked out most of the problems of the original patch provided by sven-ola on the WeTab Forums. The patch is formatted incorrectly, maybe by the forum software. Here is the patch that seems to work (saved as chrontel.patch):

diff --git a/Makefile b/Makefile
index 3a5936d..b7a8df3 100644
--- a/Makefile
+++ b/Makefile
@@ -20,11 +20,11 @@ all: $(MON) $(BUG)
     $(CC) $(CCFLAGS) $(INCLUDE_DIRS) -c $< -o $@

 $(MON): $(OBJECTS) $(MON).o
-    $(CC) $(CCFLAGS) $(INCLUDE_DIRS) $(LIB_DIRS) $^ $(LIBS) $(LDFLAGS) \
+    $(CC) $(CCFLAGS) $(INCLUDE_DIRS) $^ $(LIB_DIRS) $(LIBS) $(LDFLAGS) \
                 -o $@

 $(BUG): $(OBJECTS) $(BUG).o
-    $(CC) $(CCFLAGS) $(INCLUDE_DIRS) $(LIB_DIRS) $^ $(LIBS) $(LDFLAGS) \
+    $(CC) $(CCFLAGS) $(INCLUDE_DIRS) $^ $(LIB_DIRS) $(LIBS) $(LDFLAGS) \
                 -o $@

 clean:
diff --git a/ch7036_monitor.c b/ch7036_monitor.c
index 5cfcc2d..ecf2d90 100644
--- a/ch7036_monitor.c
+++ b/ch7036_monitor.c
@@ -762,6 +762,7 @@ int init_lcd_timing(struct timing_ch7036 *lcd_timing, int *width_fix,
   lcd_timing->vo = xmode->vSyncStart - xmode->height;
   lcd_timing->vw = xmode->vSyncEnd - xmode->vSyncStart;
   lcd_timing->scale = MK_SCALE(0, 0);
+  return 0;
 }

I place it in my home directory, and run all my terminal commands from there too:

git clone http://git.chromium.org/chromiumos/third_party/chrontel.git

cd chrontel

git checkout 697c6bd5237fa800c314153779624187a9c4e0e6

patch -p1 < ~/chrontel.patch

I do get this output, so I haven't actually tried to compile it yet.

$ patch -p1 < ~/chrontel.patch
patching file Makefile
Hunk #1 succeeded at 20 with fuzz 1.
patching file ch7036_monitor.c

I don't know what the 'fuzz 1' is, but most likely more formatting errors.

EDIT: I worked out the problem, and don't get patch errors any more. I updated the posted patch.

[waterhead]

I have been working on this patch on my desktop, with Fedora 20 installed. After patching the source, I could not build it without getting this error:

$ make
cc -Wall -Werror  -c ch7036_monitor.c -o ch7036_monitor.o
ch7036_monitor.c: In function ‘main’:
ch7036_monitor.c:1017:20: error: ‘width_fix’ may be used uninitialized in this function [-Werror=maybe-uninitialized]
     init_lcd_timing(&lcd_timing, width_fix, xmode);
                    ^
cc1: all warnings being treated as errors
make: *** [ch7036_monitor.o] Error 1

It was previously reported in this Google Group post:

http://code.google.com/p/chromium/is...tail?id=215604

And fixed with these two patches:

--- ch7036_monitor.c
+++ ch7036_monitor.c
@@ -737,7 +737,7 @@
   return 0;
 }
 
-int init_lcd_timing(struct timing_ch7036 *lcd_timing, int *width_fix,
+void init_lcd_timing(struct timing_ch7036 *lcd_timing, int *width_fix,
                     XRRModeInfo *xmode)
 {
   if ((xmode->width == 1366) && (xmode->height == 768)) {
@@ -785,7 +785,7 @@
   int probe_only = 0;
   int dummy_i2c = 0;
   int verbose = 0;
-  int *width_fix;
+  int *width_fix = NULL;
   unsigned char edid[256];
   unsigned char newedid[256];
   int use_new_edid = 0;

--- Makefile
+++ Makefile
@@ -20,11 +20,11 @@
     $(CC) $(CCFLAGS) $(INCLUDE_DIRS) -c $< -o $@
 
 $(MON): $(OBJECTS) $(MON).o
-    $(CC) $(CCFLAGS) $(INCLUDE_DIRS) $(LIB_DIRS) $^ $(LIBS) $(LDFLAGS) \
+    $(CC) $(CCFLAGS) $(INCLUDE_DIRS) $^ $(LDFLAGS) $(LIB_DIRS) $(LIBS) \
                 -o $@
 
 $(BUG): $(OBJECTS) $(BUG).o
-    $(CC) $(CCFLAGS) $(INCLUDE_DIRS) $(LIB_DIRS) $^ $(LIBS) $(LDFLAGS) \
+    $(CC) $(CCFLAGS) $(INCLUDE_DIRS) $^ $(LDFLAGS) $(LIB_DIRS) $(LIBS) \
                 -o $@
 
 clean:

I had to apply these two patches (I manually edited the files), and then I was able to compile it on Fedora 20 too. I am posting it here in case others also run into this problem.

[daniel-holz91]

Today I got the recent version of the Chromium OS Ch7036 driver to work under Ubuntu. I just applied the patch from the WeTab-forum, swapped audio_utils.c and audio_utils.h against the ones from the old version and copied edid_utils.c and edid_utils.h from the old version into the chrontel folder of the recent version. For my suprise I could actually compile and use this patchwork-driver. I call it the Franken-Chrontel.

You can find my updated guide here: http://lackofalucidmind-en.blogspot....mi-output.html

The only thing we need now is a package and a PPA. I was able to create the first one but it would only copy the files to the correct places. It wouldn't make the necessary changes to /etc/modules and without that the driver doesn't work.
I failed with the PPA because I have no idea how to convert this hole bunch of files into a source package.


To the new version:
There weren't many changes since the old version.

[daniel-holz91]

Because there are still some problems caused by the missing Edid-detection of the chrontel driver I kept searching for other solutions and found this https://build.merproject.org/package...e%3Adevel%3Aux

It seems like the Mer project has it's own fork of this driver which contains the files ediddata.cpp and ediddata.h. Maybe it works better but I get errors when I try to compile it.

Edit: Well I got it somewhat working but still no Edid detection and because this older driver has no fallback mode for this case it just doesn't do anything.

[waterhead]

I have Fedora installed on my Desktop PC. I downloaded the Mer .rpm file, and was able to install it without any errors. It has these files:

/etc/dbus-1/system.d/com.tiitoo.HDMI.conf
/etc/modprobe.d/chrontel_i2c.conf
/etc/udev/rules.d/10-kernel-chrontel.rules
/etc/xdg/autostart/tiitoo-hdmi.desktop
/lib/firmware/chrontel/fw7036.bin
/usr/bin/tiitoo-hdmi-daemon
/usr/bin/tiitoo-hdmi.sh

To run it, use this command:

tiitoo-hdmi.sh startup

I don't have Fedora installed on my tablet, but I may give it a try.